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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcca4b6d503824711c2b63db35af6d49135059d2af2577755f1b73d07ef7207' 
  AND token = '4VqOHxW83phrbDfv006swUuF4n9dBY8AEkkunBBUDm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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