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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bc4b232a60b31e48592f0a44d95318d5855cd6657a8c75a3b0997dbcbe8469' 
  AND token = 'skBZk1Vcl01ohGPPJfYtsDCfXCTJzTbe1/WuatoAVdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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