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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e490a68929c4a5928c0c3141607b7c56698961d7e22459c6c3a768812b58f767' 
  AND token = 'EYeVWRJcS/voKWqIKMMo0o+lGfvJtIeWoL0xVDUArak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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