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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b71e86ada54e296485fcf47ee2d46f922bb7df42ca374a8bd459103aa8ceaf3' 
  AND token = 'pcP/mAICyuuEF+8u/fNTSEGcroxgCsxCenuq/wg/13Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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