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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7dea7d336215ae51936218a7b7b3691c49a46cf4cd4539f7e5b095b91c26a3f' 
  AND token = 'MC/BfI9h4m157AJLxNYIITTV2M05TYPMYRIEWV6K7mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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