SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc3b0b958197ebdc2c8ef1ec9dbba48d6800aef12e387465926d97f1d22d662' 
  AND token = 'UtGTl/WfPwMPXFDKl+MSosPacxWBkJC+SgHVIQ9vMsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00138

JSON explain

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