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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8020c8d05771074c84629d57298e772de4c15c6cd699adfdd9e97b852f2c039' 
  AND token = 'uifoD2C6B7OOO82Gns7h601rlZCi7cGT4DAZ0e1wDsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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