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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c329ac8d820ee36b0dd1df9c40dd27ccc63878d8e1ca386903bbe505fe0e7ee7' 
  AND token = '1Dg+i8KxtsGQmh2bEUaCm9okEK+NKT8S8CSltWMuy30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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