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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa34b79e28c5416fd1de4764eda85eefc5875848b2d59c6cc41991d1e9234b5d' 
  AND token = 'UbnpSHPDk0dBzjdHm1qwK55rUTpRpIOSK4lt8vbvYPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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