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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d935c5e392ac1527d5f676e13d74cf8e7d8af99ba1485a819469278f54e03a' 
  AND token = 'k4Th7I6rCV2MnsqQVavjSvtQUaZTVY893jt0k/ehvxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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