SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74601927bdf1c1192d812cf76ba9bcab38f51964f5e1c8955f2725e5158e463a' 
  AND token = 'OZpOIExQF+ssY4tvA+/En9UUBHDhZL8Y0V8X7Jlz0B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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