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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9153b4e5088236646f4d29e7c8b0fd2f99c32e018094ac9a3c9e0e4ea813655e' 
  AND token = 'MpcKcP/Jhd0E9vBYwilzueWzXsPHjhleK1xptdrvz2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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