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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14098d21e002dd66b74edb9311a489a0a6b0c8d3973a0791232a55446f3c2513' 
  AND token = '8egGoHlcbUBtrtCxlmtwFDYe61g1UL9+Xk56KqmrN0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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