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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82ba9258efa71a661413cf3bac2bf570b28fb01e76c010d51b6cb3e7fb4fd26' 
  AND token = '9l/ioXWvD6IHi3sg14tT+nrhSAcxgPyn+AU9fFyUks4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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