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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ed4aa69611da120239696f0ae706d106fd697b1ef0fb293608f77a48964a06' 
  AND token = 'mBYc2cc+pU4rwt6eOnC5nN9y7QVaalORPCpxAgAl124=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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