SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d07a0f34e50a453c406917953817c0509ccc2527ef6bd88bd8ae5247ab933f7' 
  AND token = 'lEXCHzxJdYGJtDMLZISpqr6CKN3dAqqkIrRXarrwnBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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