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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a2d62c0887d438794ccde437bf39499e432fc1fc5fae2dab79df2a2089df54' 
  AND token = 'XZ+5ddBSGcpd5iQE2QxJh5NihqUKM9rrPJa04IPmVBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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