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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e69571ec3a9d2725dda465de5c04e464943e5a542ffac8ad9c119206cf7d6a5' 
  AND token = 's5hBlvtz/oVJdhz0cNm4+caHptxlEFwZvLiLnns5KBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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