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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b200ee4b13632d3153928ab37b64bff23194d0efde7b8417802eda439d947f0' 
  AND token = 'UljtWxWThuXQOA6z4M0V9HuC5Ha2Kg4jdxXHHnO/iBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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