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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bbfbdb7e655ca7560b3def47cfa8ef4fe15443afec88ab09b497f4994a21c7' 
  AND token = 'DdmojRSxFbDXnLCRFyWCFP45csFJr0Ne47+ooQZOdxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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