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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b1976e2131cfd81f59ee9839af925c8397e0a73fb9cfd2de93597eb4584392' 
  AND token = 'bIKE2G8U4ERL96CF/wqC9LmRIrsmm9VjWKcZVU6OPb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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