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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba2e528f0280d1ecda0ece31eb1ec4e8f767d07651b08277310d0b3fa07fce8' 
  AND token = 'pz1IDQA+eLrY8fP2oQSuN/y4sSZgw2j6fzZ+4xdyA5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}