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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f0c8b881b26218fecc84448b3d692c61c73dd6ba4c225acc6cefd121ea4c21' 
  AND token = 'AFq1apFcz+IN55tRI8xZOvH8rG0EHKLrTyKVdNcVfTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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