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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7048b0ca38e5bd5d9c3cadf5954b9b98f5fa3869fb7d242edb2451984c73e41c' 
  AND token = 'u/X8gUq96OAcZYE9tSegRHULede1j6E9IPZfAX0cDN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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