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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbc3ff8f483ea9ec3ab934c97cb929022772600934d0368e85a86dafdc9ab81' 
  AND token = 'H/rcScwKH/SRhMsT0u3vC7Zzyusb4pwq3qUz1UpLPTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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