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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1ae2db75b409a7b9d6bc5e726b9eb0e83e655411ea7ca77efb752e8fe310d6' 
  AND token = 'UqO4OYsAimh9x5YCdZihfSIKN1wOL8KcSD3xmSLTzzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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