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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1577d2afb6f72ea382069ede84ae8a6fb3f2df9fceea3325eabb8b30d65b614c' 
  AND token = 'FWxc7XeElnsUgsZzBsHzWX6OZq3Z4g/WCiKfOsJFWQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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