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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9a2bedb97abfe62e709a7f78fbec8458d8c9bf9f42f7d55c7732b1400b42c6' 
  AND token = 'kgZxKVUKuRwOQknjkw5P3twklZxlNcpGtkMbxj66hEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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