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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39475b7b0da1655cab0113e591226db2bac3bb32742782622eb7012eec26291' 
  AND token = 'LeffKg8GgT3AxGJn8n3YiF07C74URDtjiiXnw4YHn2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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