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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c763b6c51ec99d170d97db462cb9a842b0d1e89ec61b737dff903a781493565d' 
  AND token = 'DYkyBylo3agzpOlsp9T5BgONqZ2VPNgivNnXsM80mss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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