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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abee54df02a45485fb3cb7dc7ce7e4042746a32c480fbfcad5b716e2af575fee' 
  AND token = 'u8gJlfyCuUGZ8GPc1FR2AGnjn2w+egyBL/l4AuUBU1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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