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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8787572e09af91425d6bb192b2c3984b77afbe26db7206026a01e32b9de523' 
  AND token = 'WXP8ka6ystU/WW3IeuZ/VQiXzV+25Llii35YEO+oJnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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