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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5c216773d4548ffaa749c8a07b9dcfd36436917e63363e3029fcf2b567503c' 
  AND token = 'S0dji2pHVDPepnmbze6+14LoP0gu9n7E3MsQQ9kaCDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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