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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ce16d842df2fa56a0c54c5434630ea65970d3dde174930db179583579567b2' 
  AND token = 'Jfg9AJ/SU0T6wRBJxx/Cg9S8m2PNLJ/6SiM96GwAzCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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