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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dd08cf8257ba0871d21080650186fc504f2132dd211baf368cab43ccaa77d4' 
  AND token = '8Oyol7OYI2xGAq7jEfR9AkXZO0M8LZGOuN/JLBNMmiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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