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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0834d0b6b87567e880cc24f5488bc1f81f640be4268c865eb265fc976a3fca74' 
  AND token = 'UALA/AbfdblXkr5y4sRNDr2Zps02rrQyo2mh0Ct2lNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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