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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ea0643797cbf9be795aa2f4b0132900e619eda7a55d8cf825161fd2f314ee0d' 
  AND token = 'LAPJM1FFr7Xy2HIT8ZdK15tM9sA/Okt30t08e1w7EHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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