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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2890e6b4f809a7580df98db483f8975f6c623a222e7ee5cdc5d057d5d1916158' 
  AND token = 'tZKiaAchMFI1AU7HezMZFFnx3dh2uvjcvoPJceMzyIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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