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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abbd06a8e27b65bb27956f3a8b063d34e53adfb4b08d843571c3029097f0ddb' 
  AND token = '9A5kiFxDr5CcJRQBtzso2Oep3hagLuxTwNRyIcwUiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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