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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af910cff0b19361853416f7ca3e1b62cbf81bec217aa83c07694d870e5f0124' 
  AND token = 'moM8nrG7Q0P6ezxRMNsp4qE2CgVI2wU2eO5nGnH4uWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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