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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babad5bd064fb8d11812233fd1f17e37130cb980cf8b90ea717cfb662027755c' 
  AND token = 'JF6kR6EE9oBGGrWOeH/4A9vDrXsI4qbT2XTydqQmdbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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