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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42aa1a1f1ee5c7cfca2013bcc9db12d12e7dd9127cf62b8e08bda5cc235c0b34' 
  AND token = 'lvzMOWgBnJPENNDLBTB3C+yGeuP41hev4Rhk/9kk9bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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