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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6408e526a5e6a63247261128800e56da6307d60ad037eb4a15dd7e4f7c73483' 
  AND token = 'uRYdkdDyL1ivHKl6izc6oUruP+8sR7/EdxSTPnr47MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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