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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c813f109ea2ed9ad420ef2b7c7bac8ed22d6305ac68993357b623682d3a7a25b' 
  AND token = 'c7hYEjZB5/2MsOS5vOGWMUwOdvs+SEDo+d6Zp7yLhSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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