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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19993ed19c891335d9d9b3997e4f5c41a7eaf836733d5e5aefe38429f6d4f43d' 
  AND token = '08SYfbLELVLTpUMIq+RSltjhIISwTFmRjzsXcnv2X30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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