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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71102ecea941f06cd774c40df115604cb72f62d325de0ce868f12537d3465470' 
  AND token = 'URJDSwnRsHBd7t/agYjLBHtrYi0iGl2V9dtFJu3Cmi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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