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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebe1969b3cbb7d69c1d7533556e3c2a2adb2ccbf8f5c719d8241a0a5af8d90a' 
  AND token = '91rdj4Sedeg9PzDKGTDwuzxhC6OPZJ3YsGdHf9dTlNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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