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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae86e029e09775323d01a9a124f710dd8c0600c21ef204c5dae20ad1d46e8920' 
  AND token = 'xKHCSV/kUtQMdxeTSkyE9w7+js30ElG1OvcoUW1jZQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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