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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd936166714e99c24e4f8632732ca8af1d5570e14c0e73d20e6631ee87857eacf' 
  AND token = 'fu5Z+kX/nVhMU+CpH7ynFXV9psXGoJhbnmmUVyAHryk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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