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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f09aec5c45f7b7c60ad8db687954756837740d743c4b9c2d716297620c4503d' 
  AND token = 'i4JQBwEpTvcgdI97KO90BQt8Q5hFXC3LzBBSb9ZTFBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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