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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b6bcddd243a2a923c3353aa7a66949c43b97f53a189f184e436fc4277eca4a' 
  AND token = 'vZQGyHatpCz1oGM3eH6MAO/YzXgo7tqRO5xfdhS5j0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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