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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952742a83f15b4bd03cd0adef4b1af77c8bcbe6ca854b9b74f7408d9bb1c9407' 
  AND token = 'Tq9L0EvjNIz+45GWRIgglI3m0eDX8RSnkvU72buqWKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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