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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899ae0293dcc5f77aabb74702b7874c698fb8cf023d0e1f984f1c169b80c9950' 
  AND token = 'zGez86yRr0JwvMeNfgvhMLwM9mgBvpbzH8QuIhaA0+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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