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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6cc57faf5b2d28d3e0f533ccb6234f4a74e53ca094b95042075bfe277b996b' 
  AND token = 'j+RazHam0OADaw87Gh7Z2CNjHs17GWs68Gg/KaFrK6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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