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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f2d2fa024a6461c213d3de586e3b598aff64b1734b3538a4a321f01e7a2f71' 
  AND token = 'MMgJNQSorff3+uI/bpBZXlbEfaoKNpqsgsbOalQoQMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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