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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1bc775d1aae28b714abbbec50e8b5096068fa8401b2417fe1c1b1106af6d03' 
  AND token = 'wNxf62FF9Ena4b+JXMxl6287KZNuQMgI8CBjwyvVvJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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