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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506371ce7c2a40f1c797ad8e63c2d9bb1827365c709b180370f5dd151aa5e631' 
  AND token = 'pa5JW9aUYjov+BYRHFsOaqlZyOYyaObyFmXJaacv0JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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