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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee4c0d34c617a4c9c63c129031cb18aa6c89fb17d7699a8e3a898e07d07f4af' 
  AND token = 'L5ILOdzomo5yB2f+iARHDg/jgRnFxDcGMSXcEjE1jjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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