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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948233ff8a6ccbcf041026f5ff5a98f81897d44b7226bc19d14c185477bc87cf' 
  AND token = 'ecoMOTz/3BT+T7uNByYfOSwJR6O075XHNHXUJGMqCZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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