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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76add531c0978b68ca9062857e6894601254b584d4c0082a285fa6bd38af588b' 
  AND token = '78gEa2c/P/8oHjI0D/Jm5JsnOvvFjmrhgU4MMY887J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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