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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4e6c15d40b02c94cfc66b5a86a3baadebb327c4cb939d85792969edc412f7c' 
  AND token = 'qfvtSz4rME+dpG8psX3HGhWy2sN3T45VtHKbF0KRofc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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