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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffd01dbd50e8eb5f7b045d20ef87b349fbaab29ce47731ab05c11796f32776c' 
  AND token = '9dK54s71vWdtLAUEMJ+e/1S9nhED+/MncuMESyZt4I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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