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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660d28001c0bcf978f2b4f3194896afc6b71d05b9bd465d70a896f2fc0ea3b2c' 
  AND token = '+M+qCi94N3ee2hPyQ5MAOVJMgsNkguiFnlzK1omsAk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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