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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '006e145ae3f60331dc4976dd664687c55fad0f9204c71f26dd72be26222e261b' 
  AND token = '2nnbojr6rwdxeaeh5EAb02FkUJkT/sk1P2oKXKxFpp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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