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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0a0989ab5b974eafa4ac3aca1214913271cbd3aa8b6fb19cf22fc80b601fc0' 
  AND token = 'cmn6eWyQbE4g6yR64Y9CdtPssbrSN7lF9AraGxbKwDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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