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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e832ab3ffe79d944ea4bd8ceff43b32c272d4cbe2a6476adce362d613f7b4d' 
  AND token = 'KUkh6vnpr8Ux7m6+CY7RrnyzrEcIjuedzSdBew3USno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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