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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c412803046031c899d410e4a63e14e88d10c230e7bb5be58e77ef9345247fb1' 
  AND token = 'zyvdM1Hw0YrlhTBWWNa+pqPWmfiNj5NaOfbkxUXJ9+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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