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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cb11e9f9d093e0bfd3e3848818e9f0979f5e9b8c570a5a7d7ef4d319d38c2a' 
  AND token = '4W3XLlgu2HzqzGtaSPxNO5jEmbRRRDe2GuWRICPBt30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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